Service difficulty report · Stiffener · Boeing 777222

Difficulty date
September 17, 2001
Submitted
October 2, 2001
Operation
Air carrier
Aircraft
N775UA
Make and model
Boeing 777222
Aircraft serial
26947
Aircraft time
24,250 hours, 4,791 cycles
Engine
Pwa PW4077
Part
Stiffener
Part number
141W85189
Condition
Cracked
Location
Rbl 38
Part time
24,250 hours, 4,791 cycles
Stage of operation
IN
Nature of condition
O
Precautionary procedure
K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

STATION 246 RBL 38 FLOOR BEAM VERTICAL STIFFENER CRACKED. SUPPLEMENTAL DATA UPDATE MAJOR REPAIR ACCOMPLISHEDFABRICATED AND INSTALLED NEW STIFFENER.NOTED CRACKING OF THE STIFFENER IS DUE TO THERMAL CONTRACTION THAT RESULTS IN HIGHER THAN EXPECTED IN-SERVICE LOADING OF THE DOUBLE DEPTH STATION 246 FLOOR BEAM. PART IS BEING REPAIRED. REPLACED STIFFENER.